Hey there, PaulDT! That's an excellent question. There is no extra charge for installing a TV mount into a standard wood-frame wall with drywall. For harder materials, such as your metal studs, there will be an extra charge of $99.99. Feel free to call us at 1-800-GeekSquad (1-800-433-5778) if you have any additional questions, anytime! An Agent should even be able to to do a pre-survey for you, which let's you know everything that might be needed for the job, as well as the estimated cost of the service.